Even while defending, a scout can be a damage and kill powerhouse, with the scattergun obliterating enemies with two or three shots at point blank range. They are also very quick, meaning that they can be good at killing the medic about to charge a heavy, an engie about to build, a spy cloaking up, etc. Also, scouts can milk opponents and mark them for death, greatly increasing defensive survivability.

Use BONK! to get past the front lines, destroy the teleporters, take out snipers and pick off people as they come from spawn. You can get a lot of kills this way, and eventually you'll usually get 2-3 people chasing after you.

If they're chasing you around the backfield, they're not pushing against the rest of your team.

Also you can use BONK! to help protect your sentry when they pop uber, block incoming rockets, grenades and minigun fire.

Scouts is very vital in defending. He got many wepons which can help the team, such as: Force-a-NatureSoda PopperSandman etc.Scouts are also very fast, so getting to the front line is quicker than other classes. Also they have the ablity to doulble-jump, so they can annoy people, such as heavies,soliders and etc, while doing damage.